Printer and changeable light source therefor



P 1951 w. L. SULLIVAN 2,568,097

PRINTER AND CHANGEABLE LIGHT SOURCE THEREFOR Filed Jan. 4, 1949 6Sheets-Sheet 1 IN V EN TOR.

Sept. 18, 1951 w. L. SULLIVAN PRINTER AND CHANGEABLE LIGHT SOURCETHEREFOR 6 Sheets-Sheet 5 Filed Jan. 4, 1949 INVENTOR. WZLSZLZZiI/m BY4.2.5 flfiorngy Sept. 18, 1951 W. L. SULLIVAN I PRINTER AND CHANGEABLELIGHT SOURCE THEREFOR Filed Jan. 4, 1949 @HIW 6 Sheets-Sheet 4 IN V ENTOR.

%is lfP-iorragy Sept. 18, 1951 w. L. SULLIVAN PRINTER AND CHANGEABLELIGHT SOURCE THEREFOR 6 Sheets-Sheet 5 Filed Jan. 4, 1949 40m WAVELENGTH//V L JA// INVENTOR. VIZZ.S2ZZom BY %z1 flfiarngy Sept. 18, 1951 w. L.SULLIVAN 2,568,097

PRINTER AND CHANGEABLE LIGHT SOURCE THEREFOR Filed Jan. 4, 1949 6Sheets-Sheet 6 M $5 n W M EY R, QNMWN mm U dQ MMIFMWLJ .s e gw a n it ihj i wihfe g. 1 is a side elevation of a printer for photo- PatentedSept. 18, 1951 UNITED PATENT OFFICE 2568,09? PRINTERrAND oHANGEAiiLELIGHT SOURCE THEREFOR Warren L. Sullivan, Rochester, N.-Y., assi'gnor toParagon Revolute Corporation, Rochester, 'N. Y., a corporation of New'York Application-January 4, 1949, Serial No. 69,161 I e olei s. (c1.--e5-'-7-5) This invention relates to printers iorfphotm sensitive sheetsand to lighting means forfuse therein. I v 'The conventional printerfunctions Well 'in .niaking blueprints, blue line, prints, vVanDykenegatives, brown prints, dia'zo prints and like ,phetbsen'smve sheetswhich can be printed by flightfrom a quartz mercury vapor lamp. I-Io'W-e'verQs'ueh a printer 'is not versatile enough, with out changes in thelight source thereof, 'to print 'satisfactorily a type er photosensitivesheet flinovvn to the trade as Autb'pos'itive paper. This tipe of paperfor satisfactory results, requires a light source in which the blueportion of the js petrum is substantially absent but the usual Iduarltzmei'cury vapor lamp generates light inc'liiding a considerable aniountof the .blue porf t ion offthe spectrum. Consquently jwhen Autopaper isto be printed on a conventional p inter, it has been the practise tofeed "e' filter e'et for blue light into the "printer along withsiitopositive sheet and the traeing'to e iiri'nted.

This has been a sourceof annbi anc'e and tends toslow down the work oftheoperator. It has been proposed to introduce 'affilte'r for .biue'light betweenthe quartz lafnp and the inside jspr'r ee or the glasson't'act cylinder. The extreme heatdevfeloped Within the cyli'iide'r bythe .d uar tz lamp, has made it diificult to 'mo'urita suitable bluelight filter within the eenteet'etnnder such a position that the filtermateria 'will Inbtdeteribrate quickly as a reenter the'presene'e lof theextreme heat from the lamp.

' n accordance with the main faturebf the present invention it isproposed to inv te fa. @iiltr unit Whibhcan be quicklyintrd'uce'dtvithiii'th' contact cylinder of a conventional printer xvhen .Autopositive paper is printed ,epa wmeh easily reriiovediwhen'other types of -photosensit'ive sheets are to be primes;

accordance with another feature of I this invention there is provided acombined fiiterefnjd fngneum which can be readily insertel ljiiiithinthe ,foc' ntact cylinder of the printer ior iise instead of the quartzlamp when Aiitdbditive 'jpe'per' is to be printed.

' iccoi*ding to another feature of the invention, ther'e is provided areplaceable unit or frariie ha'vinounted therein a plurality of greenfluoresinateriaito filter out any blueligh't.

V fjO'ther features and advantages of the nventailed eee" "tionan'd s ,mwhich:

tion 'will appear from these blueprints and t e like: irom tre'ciilg'js.This through which the unit of the p'resnt inv. t

suitable manner and are provided with Sensi paper a idf e ike s p 'flili f. fe t i the present invention incorporated therein Fig.2 is alsectionaLview taken substan 'on the line 2- Z of Fig. 1;

.Fig. 3 is a frontrelevation of a unit p'o pris me jemultiple tewrce 'whi fil erjwh can "be 'remov'ably supported in the printer;

Fig. 4 is an end view of the unit of, Fig. 3; h Fig. 5 is a sectiontaken substantiallyon tlie line 5-star Fig. 4 lookingin'thejdirectionjof t lie arrowsand showing particularly the n ountingfo'forient the fluorecentjtub'e's the unit;

. Fig. 6 is an enlarged fragmentary. sectional n w taken'substantiallyon the line 6&6 of.Fig. 3 showing particularly onelpng'ituclinaLedge pi the unit and themounting thereon offone of thefoller which facilitate the'insertion andremov al of the unit from theprinter; v ,7

v Fig. 7 is an enlarged sectional view taken sub"- stantially on theline '1 or Fig.3 iool ing gn thedirectionoi the arrows and, showingthe"con' struction of the other longitudinal edge of "the unit;

of Fig. 8;

.Fig.l1 is a fragmentary sectional view ta kfefn onlinel lll ofFig 8; gi -Fig.l2 is adetailed sectional view. offt he unit tahen on the linelZ-lfdf-Fig. 9; and

. i 13 w tt vi eth ct ik i ii i 9 e een upies e l mpend else sh wmi theifect of passing this light through a eilo1it Referring especially toFigs. '1 end 2, t eses-e disclosed a conventional type of printingmechine which is'adapte'd tor the printing of sb ee fnp is j li se i rjn 5 be defi ha Opp ed spe th r in .i rqe hw h a conventional lightsource L can be servi c n b in o ued. into. t e. a ne f i irames aresupport eiiin spaced relation in l g in v'vhich spaced pairs of rollers1 and 8 (Figs. 1

and 2) er j'e'umnea. These, re lers. eupbcjjrtga transparent Contactcylinder l0, ererere'my'meae .a horizontal flange 25. of these flangesis lined by a strip of felt 26 or the of heat-resistant glass and openat its e'nds'. Each edge of the glass cylinder is reinforced by aflanged ring l2 with a layer of felt l3 interposed between the adjacentmargin of the cylinder and the flange thereby tending to protect theglass cylinder against breakage. The peripheries of the rings lz ride onthe pairs of rollers l and 8. This cylinder" is adapted to rotate aroundthe light source L located coaxially therewith.

As shown in Figs. 1 and 2 this light source is preferably a quartzmercury vapor lamp l4 which is completely enclosed by a transparentshield l5 of the type disclosed in Patent No. 2,457,353 granted toDavis, December 28, 1948, and owned by the common assignee of thisapplication. .The shield I5 is secured adjacent its ends on bracketsiii, in turn attached to uprights ll integral with 7 end frames 5 and 6.

The glass cylinder is rotated by an endless belt l8 which engages asubstantial portion of the periphery of the cylinder so that aphotosensitive sheet with a tracing or the like superimposed thereon,can be held in close contact with a considerable area of the outersurface of the glass cylinder, during the printing operation. As hereinillustrated, a single endless belt is used for this purpose but it willbe understood that a plurality of belts arranged side-by-side and havingthe width of the single belt, may be used instead. The path of the beltcan be traced from the lefthand side of Fig. 1 where the upper sidethereof passes around a substantial part of the periphery of thecylinder and thence around the guide rolls 2!], 2!, 22, 23 (Fig. l) andguide rolls 24 (Fig. 2). It will be noted that guide roll 24 is securedto the shaft on which the guide rolls 8 are mounted. A suitable drivenpulley (not shown) serves to drive the belt in the direction indicatedby the arrows.

It will be understood that in use, when the 'iphotosensitive sheettogether with the superimposed tracing thereon are inserted at the pointA in the printer, they will be engaged between the belt and the adjacentportion of the peripheral surface of the cylinder in and will beadvanced past the light source L. The tracing and the portion of thephotosensitive sheet printed therefrom will emerge from the periphery ofthe cylinder at the point B where both of these sheets will drop into asuitable receptacle (not shown).

The opening in each frame is surrounded by The inner edge of each likehaving one of its edges closely engaging the face of the ring 12 locatedat the adjacent end of the glass cylinder Hi. This felt serves to reduceleakage of air between the two frames and the respective ends of thecylinder so that a cooling stream of air can be drawn through the cyl:inder by means (not shown), without the possibility of substantialleakage of this air at the junction between the frame and the rotatingcylinder.

' In the conventional printer there are provided adjustable shutters 28and 29 respectively located at each side of the light source, whichshutters serve to vary, at will, the time of exposure of the*photosensitive sheet being printed, to the light passing through theglass wall of the cylinder ll). Mechanism is provided whereby theseshutters can swing toward or away from each other to determine thedesired aperture for light transmission. As shown in Fig. l the shutter28 is se- 4 tion to the first shaft. These shafts are journaled in thebrackets IS, the shaft 35 extending outward through the opening in theframe 5 where it terminates in a bevel gear 32. This bevel gear mesheswith a second bevel gear 33 secured to a shaft 34 which is rotatablyjournaled in a part of the adjacent bracket l6. The shaft 34 terminatesin a hand wheel 36 which serves to rotate shaft 34 and in turn the bevelgears 32 and 33. These gears rotate the shaft 30 which swings theshutter 28 with respect to the light source. The shaft 3| which carriesthe shutter 29 is provided with a gear 36 meshing with a gear 31 on theshaft 30., Consequently, when shaft 30 is rotated in one direction, theshaft 3| with its shutter 29,

is rotated in the reverse direction. Thus by a single operation of thehand wheel 35 the position of the two shutters 28 and 29 can be adjustedat will to increase or restrict the size of the aperture.

In accordance with the present invention, there is provided a metallight shield 39 of a size to project through the contact cylinder and tobridge well beyond the portion thereof between the points A and B (Fig.1). This shield has its outer surface covered with felt or the like sothat it will not mar the surface of the contact cylinder if it shouldaccidentally come into contact therewith. The shield is secured on theflanges 25 on each end frame by means of the adjusting screws 42.Apertured extensions 44 on the shield receive the respective screws 42while a pair of lock nuts 45 threaded on each screw grip an extensiontherebetween. A nut 46, threadedv on each screw, engages the flange 25and provides a further adjustment whereby the shield can'be spaced withgreat accuracy from the inner surface of the contact cylinder. The righthand margin of the shield (Fig. 1) provides a horizontal track portion41, while a vertical flange 48 secured on this margin provides a relatedvertical track. The left hand margin of the shield has secured thereto abracket 49 with an upturned edge, the bracket also serving as ahorizontal track.

The tracks 41, 48 and 49 are adapted to guide and support an arcuateunit serving to transmit through the contact cylinder, suitable lightfrom which the undesirable blue rays have been filtered. This unit whichis at least as long as the cylinder is provided with rollers 55, 5|and'52 at its respective long edges. These rollers ride on the tracks41, 48 and 49 and accurately guide the unit into and out of the printeras well'as accurately support the unit in the proper position for usewhen required. Removable brackets 54, which are attached to the flanges25 (Fig. 2) hold theunit in place.

The unit comprises the end supports 53 which are held in spaced relationby the bars 55, 56 and 51. Preferably the rollers 50 are mounted on thebar 55, while the rollers 5| and 52 (Fig. 4) are mounted on the bar 51.The supports 53 at the respective ends of the unit have insulatedlvsecured therein sockets 59 (Fig. 5) in which a bank of green fluorescentlamps 60 are removably fastened as herein illustrated. Each lamp 60 'iscovered by a layer 6| of yellow filter material whereby all blue raysfrom the light source are filtered out. A spectral curve C of a suitablegreen fluorescent lamp is shown in the chart of Fig. 13. The shaded areaD of this chart shows how a yellow filter such as the layer 6|, cuts offthe undesired blue light.

The printer as illustrated in Figs. 1 and 2 is in readiness to printAutopositive paper merely by turning on the green fluorescent lamps 60.The printer can then be operated in the well-known manner. It will beunderstood that during this operation the quartz mercury vapor lamp [4,is not used. When it is desired to use the printer in the conventionalmanner for printing blueprints and the like, the brackets 54 areremoved. The unit can then be completely withdrawn from the printerthrough the opening in the right side thereof (Fig. 2). The quartzmercury vapor lamp I4 is then lighted so that the printing can proceedin the usual manner.

In the modified form of the invention shown in Figs. 8 through 12 it isproposed to use a light source L including a quartz mercury vapor lamp Hof the type now currently used in the printer but with its intensity andconsequently its heat output both reduced by well known means (notshown) in its electrical energizing circuit. A unit including a yellowfilter alone, is used. This unit comprises an arcuating frame made ofend pieces 65, 55 spaced by the edge bars 55 and 51 as well as by theintermediate angle bars 61 (Fig. 12). These bars support in arcuate forma layer of yellow filter material 69. This unit is normally held in theprinter by the brackets 54. However, when the brackets are removed theunit can be withdrawn from the printer, the rollers 50, 5| and 52serving to facilitate this operation.

What I claim is:

1. In combination with a printer for photosensitive sheets having arotatable transparent contact cylinder, a lighting device mounted withinsaid cylinder, belt-like means covering a substantial portion of saidcylinder whereby said sheets are brought into contact with the peripheryof said cylinder to be printed therethrough, a light shield supportedwithin the cylinder to bridge the uncovered portion thereof, spacedtracks on the margins of said shield extending parallel to the axis ofsaid cylinder, an arcuate unit removably positioned between saidlighting device and the inner surface of said cylinder, said unitincluding filter means for preventing rays of light in a given portionof the spectrum from passing through said cylinder, and spaced memberson said unit engaging said tracks to guide said unit into and out of itsposition within the cylinder.

2. In combination with a printer for photosensitive sheets having arotatable transparent contact cylinder, belt-like means covering asubstantial portion of said cylinder whereby said sheets are broughtinto contact with the periphery of said cylinder to be printedtherethrough, a light shield supported within the cylinder to bridge theuncovered portion thereof, spaced tracks on the margins of said shieldextending parallel to the axis of said cylinder, an arcuate unitremovably positioned between said lighting device and the inner surfaceof said cylinder, said unit including a plurality of fluorescent lampsenclosed by filter material for preventing rays of light in a givenportion of the spectrum from passing through said cylinder, and spacedmembers on said unit engaging said tracks to guide said unit into andout of position within the cylinder.

3. In combination with a printer for photosensitive sheets having arotatable transparent contact cylinder, belt-like means covering asubstantial portion of said cylinder whereby said sheets are broughtinto contact with the periphery of said cylinder to be printedtherethrough, a light shield supported within the cylinder to bridge theuncovered portion thereof, spaced tracks on the margins of said shieldextending parallel to the axis of said cylinder, an arcuate unitremovably positioned between said lighting device and the inner surfaceof said cylinder, said unit including a plurality of green fluorescentlamps enclosed by yellow filter material for preventing rays of light ina given portion of the spectrum from passing through said cylinder, andspaced members on said unit engaging said tracks to guide said unit intoand out of position within the cylinder.

WARREN L. SULLIVAN.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 847,567 Flichtner Mar. 19, 19071,092,490 Kitsee Apr. 7, 1914 2,093,785 Sullivan Sept. 21, 19372,220,526 Klitmann Nov. 5, 1940 2,222,961 Szasz Nov. 26, 1940 2,308,130Von Meister Jan. 12, 1943 2,320,334 Bates June 1, 1943 2,346,988 NoelApr. 18, 1944 2,394,966 Floyd Feb. 12, 1946 2,459,362 Cary Jan. 18, 1949FOREIGN PATENTS Number Country Date 608,984 Great Britain Sept. 23, 1948

